We were looking for a cup to transition my 1 year old son away from his milk bottles. We thought it would take awhile, but he took to his tum tum sippy cup immediately. He can suck from the cup really easily and hold the handles well too. He now takes his milk from this cup exclusively, with no transition period required. Also really impressed with the super fast delivery. Only points for improvements are 1) there is still some leakage unfortunately when baby flings the cup around with the straw up, as this is a valve free straw 2) I wish it was slightly bigger as my child takes 7 ounces every time 3) sometimes the weighted straw detaches itself from the lid while my son is drinking 4) it would be good to have options for cups made using other materials, such as stainless steel Overall thank you for making our weaning journey so much easier 💖